Why is tea oil so expensive?

Tea oil, also known as camellia oil, bitter tea oil, and wild tea oil, is a precious natural woody plant oil unique to China; In the folk, it also has many beautiful names: "Longevity Oil", "Moonlight Oil", "Tribute Oil", and now more and more people are paying attention to it and using it. The International Food and Agriculture Organization of the United Nations has also promoted it as a leading edible oil crop. Its market price is about 3-6 times that of ordinary edible oil, and in some cases, it is more than ten times or even dozens of times.